Hydrostatic jack



D. F. GRAHAME HYDROSTATIC JACK Fan.

Filed Sept. 1.922 2 $h$8i$5h88t ii mvENTmR 1 A ygmuwuvg v A? Q 3,45%,756 D. F GRAHAME Y HYDROSTATIC JACK Filed Sept. 2, 1922 2 Shaets fihwt 2 (525 INVEQNTGR mix??? '5 the King of Great HYIDEWSTATZC JACK.

Application filer September To all iii/mm it may ocmcem:

Be it known that L DALLAS F. GRAHAME, of the city of Toronto, in the county of York, Province Ontario v Canada, a subject oi Britain, have invented certain new and useful Iiiipiovenieiits in Hydrostatic Jocks, of Which the following is ii specification.

This invention relates to iii-dis of the lypo in which the shoe of the jaw: is connocied to o i anger operating in a, cylinder and iii ii'oioli the. plunger extended by pumping the W'Giliing liquid iriom the upper to the lower side of the plunger mid my object is devise simplo 121921115 for permitting the liquid to flow" h; '15: owl thus lower the plungoi'. .Ei fljil'llllfil? object is to .plOVide 1 Q in ineaiis for preventing he opeizitii'ig liquid ill overflowing between tho cyl ncieroocl plungor.

l attain my object by m; us of the cow st 'uctions' heroinzif'ot ties nod and illusi 1 in {he accoi'nipanyin drai'viiigs in o oloz'ifiiozi of Sifllflifl in accordance with my F 2; ll plan View of the some;

I i 8 a vertical section of the jack oyliito (low showing the conduit in position to elevate the plunger and shoe;

Fig. l o vertical section of the upper part of he plung'or SllOWiI'lg i'he conduit in position to lower the plunger and the shoe;

:3 ii horizontal section on the lino V To V in Fig. 3; 1 i

Fig (5 a detail in. section of lilo air admi ting oiioohvolvo; zinrl Fig. 7 a cloioil in seiz'ii-ion of foi'ii'i of an air zi- .i.niit$io ;g imd' valve.

In the drawings like iui'nei'ols of reference indicate corresponding ports in the clill'oi'oiit figu 1 is the cylinder of tho iaoli' suit-ii ily tried. by ilTl'Jfi base '52. ".l i oi; its lower end and. 1S

ii modified eliminating;

stiil'liii 3 {it or: 1 iilidahly iiibnlzi their upper ends with the horizontal 2, 19253. semi too. 525,377.

In llio' lllllellfii of the lifting shoe 5 are formed tho passagos 8, 9 and 10 for valves controlling themovement of the operating liquid of the jack To miso the jack the liquid is pumped from the tubular plunger 4 to the cylinder 1 below the plunger and to lower the jack the liquid is permitted to flow back as hereinafter described. vertical passages 8 and .9 communicate at passogo 10, the passages 8 and 10 being provided with tho oall check valves 8 and 9 respectively The check valve 9 being}; adapted to permit only {U1 upward llo'w oi liquid through the passage 9 and the chock valve 8 being; adapted to permit only a downward flow of liquid through the passage 8. i

in the lower ends of the passages S and i are threaded a'pziir of tubes and 9" which extend (iGWllWii! lly and p through suit ablo holes foi'mod in the disk 6 and. Washer ended. out 8 and. 021 9 is threaded a closed. The tube 9 is; p i. lateral opening 9 which is loo oil slightly above-film disk 6. it will readily ho soon fhat 119 tube 23* forms a communication be tweenihe passages 10 and 8 and "the interior of the cylinder 1 bElOWlllB plunger 4, and that the tube 1" forms 11 communication he tii'oon the p. "sages l0 and 9 and. the opening 9 with the 'oi'ioi' of the plunger 7 11 is pump lmrr'ol fillkl 12 the piston rod of the 17 provided Willi the. operating lmmllo is (see Figs 1 and 2 barrel is, connected by V the i'lOl'lk'llll'l} '15. This pipe joint is of the type commonly smployod in gas brackets and permits the pump barrol to ho hinged on the concluii. 'iho conduit itself is oonmooted by 22 similar pipe joint 16 with the lilting shoe and {his joint forms a communiczii-ii'm between the conduit 15 and the passage 10 formed in ii o lilitin slioo.

llizicl (301111 .1011 boiweon that-"mp FO W1 H 9.

ii pipe joint 1% Willi ed, on ono anolilioi" and bi'oiighl into sub-' n with the jack iom the iiliove staii'iolly parallel relations siioi'zio'e.

ou t.

The i This pump ncome hicle being lifted to actuate uny reversing the flow of liquid.

1 What I cluimus my invention is 1. A hydrostatic jock provided with a return passage for reversing the flow of liqpants for old to lower the movable pnrtvof the jack; a

ion

(ill

' liquid through punipiheving a hinged connection with the geek; and means for controlling the flow of liquid through the said passage formed in the inged connection between the pump and the juclr.

2. A hydrostutic jock provided with a, return assege for reversing the ilow of liquid to .ower the movable part of the jack; o pump; u rigid conduit having o hinged connection with lhe jack and the pump burrel; and means for controlling the flow of the said pussege formed in the hinged connection between the conduit and the jack. f

A hydrostatic jack provided with u relurn passage for reversinglhe flow of liq uid to lower the niovublepurt of the juclcw e pump; a rigid conduit havinga hinged connection with the pump barrel; a pipe joint for connecting lhe conduit with the jack and provided Willi a plug adapted to control the flow of liquid through the said passuge, ihe plug being provided with means adapted to form a communication hetween the ends of the said passage when the plug is oscillated to bring the communicating means into register with the ends of the passage.

4. In a hydrostatic jack the combination with a'cylinder having a tubular plunger slidably mounted therein, the jack being provided with a passage and provided with o valve controlled passage forming a communication with the first mentioned passage and the cylinder below the plunger and provided with u valve controlled passage forming s communication with the first mentio ned passage and the interior of the plunger, :1 pump, e conduit having a hinged connection with the pump barre-l, u pipe joint for connecting the conduit with the jack and forming a communication with the first mentioned passage and including a plug and hearing thereon, of a lifting shoe carried by the upper end of the plunger and having it controlled return passage formed therein, one end of which forms a communication between the first mentioned valve controlled passage below the valve and the opening in the bearing for the said plug, the other end of the return passage forming a communication loot-Ween the second mentioned valve controlled passage below the valve and the opening in the hearing for the plug, the plug being adopted to control the flow of liquid through the return pussuge and having a groove formed longitudinally therein adapted to form a communication between the ends of the return passage, the

'-the lifting shoe.

plug being adapted to he oscillated to bringthe groove into register with the ends of the return passage when the pump burl-cl islowered relative to its'position for raising 5". In s, hydrostulzic jack the combination of e cylinder; e. tubular plunger slidobly mounted in the cylinder and having its upper end closed; a liver liquid from the interior of the plunger to the underside thereof, the jack having a return passage for reversing the flow of liquid to lower the plunger, the latter hoving a normally closed aperture adopted to autgmoticelly admit air into the upper end of the plunger to replace the liquid pumped therefrom, the plunger having air oullet' opening communicating Wi'rh the upper end of the interior of the plunger," and means for controlling the exit, of the air through the outlet. opening and the flow of liquid through the return passage.

6. In a hydrostatic jock the combination of-u cylinder; a tubular plunger slidubly mounted in the cylinder and having its upper end closed; it pump having a hinged connection with the jack and adapted to deliver liquid from, the interior of the plunger to the underside ti ereof, the jack having a return pusuge-for reversing the flow of tihe liquid to lower latter having a. normally closed aperture adapted to automatic-ell I ud nit air into the upper end of the plunger to replace the liquid pumped therefrom, the plunger having an air outlet opening; controlling the exit of the outlet opening and the flow of liquid through the return passage adapted to be actuated by raising and loweringvthe free end of the pump barrel,

7. In ll hydrostatic of o cylinder; a, tubular moun ted in the cylinder and,- hoving its upper end closed; a pump having a. hinged connection with the jack adapted to deliver liquid from the interior of the plunger to the underside thereof, the jack having u return passage for reversing the flow of the liquid to lower the longer, the latter having a normally closed aperture adapted plunger sli dably to cuutomatically admit air into the upper vend of the plungerto replace the liquid pumped therefrom, t plunger having an air outlet opening; rind 'means formed in the hinged connection between the pump and the jack for controlling the exit of the air through the outlet opening and the flow ofi-liquid through the return passage.

8. In a, hydrosta'tic jack the combination of a cylinder; a tubular plunger slidobly mounted therein and having its upper end closed, the jack having passages controlled .by check valves for leading liquid from the interior of the (plunger to the underside the plunger, the.

and means for, air through the pump adapted to dejack the combination E0 basing the 4, v thel-ec fg aa pumpnmmwa, game gwmfb 00-"- mctwn the 33,211: hquld thmugh he 3836;

sagesi, rim 5mm mug mm.

nearing I mm gmssages liquid m Re -5&1"

sages and whiz c-paning in the plug 3 ing 20m @pening mm municating with file \pump barre 1 116. adaptad i0 cmnmumcate with the fill-5% mew aimed pix-6115 725 the ping aiso bqzix'zg p1" vided wiih a, groove adapted to be bzmight into i'sgister with and. form a cmumunkeation betWe/en the ends of the return passages Signed at 'Ioxwmtc Gazmda, this 851,, day of Augast, 1922.

J DALLAS? HiAHAME 

